Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Disconnect wires from flue thermostat
Ensure boiler is cool
Ensure boiler is cool
Observation:
Measure the resistance across the flue thermostat terminals.
Resistance should be short circuit (zero resistance).
Resistance should be short circuit (zero resistance).
Isolate as per TOPs P4
and refit as necessary